This function enables the user to determine the trim line of the flange on the part. The trim line is determined so that the sheet boundary takes the desired geometry at the end of the forming steps, following by the trimming operation. The dialog box of TRIM LINE is illustrated in Figure 6.3.62.
NOTE: This function is used to calculate the trim line based on geometry method of unfolding. The deformation of material is not considered during unfolding, so do not use this method for the regions with great deformation. The user may use MSTEP die face to calculate the trim line of part. In addition, for the complicated flange region, it is suggested not to use this method either. Since this function is used for addendum, the user must design addendum first in eta/DYNAFORM.
Figure 6.3.62 Create Trim Line dialog box
GAP TOLERANCE
This parameter sets the tolerance between the selected flange and the addendum elements. The default is 0.5. If the gap between the flange and the addendum is larger than the defined tolerance, the flange boundary is selected as the outer boundary.
FLANGE
Define the flange to be unfolded to addendum and boundary fill. Click this button to display the dialog box illustrated in Figure 6.3.63. The program will automatically add the flange defined in Preparation to this list. Click Add button to add other flanges.
Figure 6.3.63 Define flange
ADD
Click Add button to display the Select Part dialog box. Select the flange to be unfolded and add it to the flange list.
REMOVE
Click this button to remove the selected flange from the list.
DISPLAY
Click this button to display the flange in the current list.
TO PARTS
Specify the parts for addendum and boundary fill. The program will add the parts created by Addendum and Boundary Fill to this list by default, as illustrated in Figure 6.3.64. Clicking Apply button, the program will automatically unfold the defined flange to these areas.
Figure 6.3.64 Define to parts
ADD
Click this button to display the Select Part dialog box to add addendum and boundary fill.
REMOVE
Click this button to remove the selected part from the list.
DISPLAY
Click this button to display the part in the current list.
EDIT LINE
For some complicated flanges, the obtained trim line may not be satisfying in local regions. Therefore, the user may modify and adjust local regions based on the calculated trim line. In eta/DYNAFORM, the program provides some small tools for the user to adjust trim line.
All of the functions in this group enable the user to edit the trim line including Insert Points, Move Points and Delete Points.
Insert Points: This function enables the user to add points on the trim line. After the function is selected, the user selects a line. All of the points on the line are highlighted. The user can click the location on the screen with the left arrow. The point will be added on the line according to the shortest length to the pick position.
Move Points: This function enables the user to move the points on the trim line to a new location. After the function is selected, the user selects a line. All of the points on the line are highlighted. The user can select one point on the line following by picking a location on the screen. The selected points are moved to the new position.
Delete Points: This function enables the user to remove points on the trim line. After the function is selected, the user selects a line. All of the points on the line are highlighted. The points are removed.
APPLY
The trim line calculated by the program is illustrated in Figure 6.3.66.
Figure 6.3.65 Before Create the Trim Line operation.
Figure 6.3.66 After Created the Trim Line operation.
UPDATE
This function enables the user to update the trim line if the addendum or the binder is modified. The trim line is updated according to the new addendum.
UNDO
This function enables the user to UNDO the result from previous operation.